CN213414108U - Balance car - Google Patents

Abstract

The utility model discloses a balance car, which comprises a first car body, a second car body and a rotating mechanism, wherein the first car body comprises a first upper shell and a first lower shell, the second car body comprises a second upper shell, a middle shell and a second lower shell, and the middle shell is arranged between the second upper shell and the second lower shell; the first end of the rotating mechanism is clamped between the first upper shell and the first lower shell, the second end of the rotating mechanism is rotatably arranged between the second upper shell and the second lower shell, and the second upper shell and/or the second lower shell are/is provided with a limiting mechanism. Its advantage lies in, sets up between first epitheca and the first inferior valve with slewing mechanism's first end, and the second end sets up between second epitheca and second inferior valve, and slewing mechanism is more steady to the connection of first automobile body and second automobile body, is favorable to slewing mechanism to keep the level, rotates more stably.

Description

Balance car

Technical Field

The utility model relates to a balance car technical field especially relates to a balance car.

Background

The operation principle of the electric balance vehicle is mainly based on a basic principle called dynamic stability, a gyroscope and an acceleration sensor in the vehicle body are used for detecting the change of the vehicle body posture, and a servo control system is used for driving an axle to perform corresponding adjustment so as to keep the balance of the system. Is a novel green and environment-friendly product used as a travel tool and leisure and entertainment by modern people. The electric balance car mainly comprises a single wheel and two wheels, wherein the safety factor of the double-wheel balance car is higher, and the electric balance car is more suitable for walking instead of walking. One type of the double-wheel balance vehicle is a swing vehicle, a first vehicle body and a second vehicle body are connected through a rotating mechanism and move through twisting the first vehicle body and the second vehicle body, and the installation of the rotating mechanism is particularly important for the operation of the balance vehicle.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a balance car which enables the installation of a rotating mechanism to be more flexible and convenient.

The purpose of the utility model is realized by adopting the following technical scheme:

a balance car comprises a first car body, a second car body and a rotating mechanism, wherein the first car body comprises a first upper shell and a first lower shell, the second car body comprises a second upper shell, a middle shell and a second lower shell, and the middle shell is arranged between the second upper shell and the second lower shell; the first end of the rotating mechanism is clamped between the first upper shell and the first lower shell, the second end of the rotating mechanism is rotatably arranged between the second upper shell and the second lower shell, and the second upper shell and/or the second lower shell are/is provided with a limiting mechanism.

Preferably, the first end of the rotating mechanism is fixedly disposed between the first upper case and the first lower case.

Preferably, be equipped with on the second epitheca and rotate the upper junction groove, be equipped with on the second inferior valve and rotate lower junction groove, slewing mechanism's second end clamp is established rotate the upper junction groove with rotate in the lower junction groove.

Preferably, a rotating mechanism fixing groove is formed in one side, close to the middle shell, of the first upper shell and/or the first lower shell; the first end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing groove; or

A rotating mechanism fixing column is arranged on one side, close to the middle shell, of the first upper shell and/or the first lower shell; the first end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing column.

Preferably, a first end of the rotating mechanism is rotatably provided in the first vehicle body, and a second end is rotatably provided in the second vehicle body; the rotating mechanism comprises a rotating shaft, one end of the rotating shaft is connected with the first vehicle body, and the other end of the rotating shaft is connected with the second vehicle body; the rotating shaft rotates relative to the first vehicle body and the second vehicle body; one end of the rotating shaft is provided with a limiting part, and a limiting mechanism is arranged at the position, corresponding to the limiting part, of the first vehicle body or the second vehicle body.

Preferably, the first upper shell and the second upper shell are provided with a rotating upper connecting groove, the first lower shell and the second lower shell correspond to the rotating upper connecting groove, the position of the rotating upper connecting groove is provided with a rotating lower connecting groove, two ends of the rotating shaft are provided with bearings in a sleeved mode, and the rotating upper connecting groove and the rotating lower connecting groove are provided with corresponding bearing mounting grooves.

Preferably, a second axle mounting seat is arranged on the lower side of the second upper shell, and the second axle mounting seat comprises a second axle pressing sheet fixing hole and a second axle mounting groove; the middle shell and the second axle mounting seat are provided with through grooves in corresponding positions, and the second axle mounting seat penetrates through the through grooves to be connected with the second axle.

Preferably, a second control plate connecting column is arranged on the lower side of the middle shell and is positioned on the outer side of the second axle mounting seat; the second control panel connecting columns comprise two groups, and the two groups of second control panel connecting columns are respectively arranged on two sides of the second axle mounting seat.

Preferably, a first axle mounting seat is arranged on the first upper shell or the first lower shell, and the first axle mounting seat comprises a first axle pressing sheet fixing hole and a first axle mounting groove; the first axle pressing piece fixing holes comprise two groups, and the two groups of first axle pressing piece fixing holes are symmetrically arranged on two sides of the first axle mounting groove; a first control panel connecting column is arranged on the first upper shell or the first lower shell; the first control panel connecting columns comprise two groups, and the two groups of first control panel connecting columns are respectively arranged on two sides of the first axle mounting seat.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model arranges the first end of the rotating mechanism between the first upper shell and the first lower shell, and the second end between the second upper shell and the second lower shell, so that the rotating mechanism can more stably connect the first vehicle body and the second vehicle body, which is beneficial to keeping the rotating mechanism horizontal; meanwhile, the structure of the middle shell in the second vehicle body can be simplified, and the production cost is reduced.

Drawings

Fig. 1 is an exploded schematic view of a balance car according to an embodiment of the present invention;

fig. 2 is an exploded view of the balance car according to the embodiment of the present invention from another angle;

fig. 3 is a schematic sectional structure view of the balance car according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a middle shell according to an embodiment of the present invention;

fig. 5 is a schematic structural view of another angle of the middle shell according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second upper case according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second lower case according to an embodiment of the present invention.

In the figure: 1. a first vehicle body; 2. a second vehicle body; 3. a rotating mechanism; 31. a first end; 32. a second end; 33. a rotating shaft; 34. a limiting part; 35. a bearing; 36. a rotating mechanism fixing hole; 37. a limiting block; 38. a limiting block mounting groove; 4. a first control board; 5. a second control board; 10. a first upper case; 101. A rotating mechanism fixing groove; 102. the rotating mechanism fixes the column; 103. a first axle mount; 104. a first axle plate fixing hole; 105. a first axle mounting groove; 106. a first control panel connection column; 20. a first lower case; 30. a second upper case; 301. rotating the upper connecting groove; 302. a second axle mount; 303. a second axle clamp securing hole; 304. a second axle mounting groove; 305. an indicator light panel; 306. a light panel post; 307. An indicator light hole; 308. a lamp shade; 309. a second axle preform; 40. a second lower case; 401. rotating the lower connecting groove; 50. a middle shell; 501. a through groove; 502. a second control panel connecting column; 60. a first wheel; 601. a first axle; 602. a first axle wafer; 70. a second wheel; 701. a second axle.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, and it is to be understood that the following description of the present invention is made only by way of illustration and not by way of limitation with reference to the accompanying drawings. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Referring to fig. 1 to 7, the balance car according to the embodiment of the present invention will be explained in the following description, wherein the first end of the rotating mechanism is disposed between the first upper shell and the first lower shell, the second end is disposed between the second upper shell and the second lower shell, and the rotating mechanism is more stable in connection with the first car body and the second car body, which is beneficial to keeping the rotating mechanism horizontal and more stable in rotation.

As shown in fig. 1 and fig. 2, the balance car of the present invention comprises a first car body, a second car body and a rotating mechanism, wherein the first car body comprises a first upper shell and a first lower shell, the second car body comprises a second upper shell, a middle shell and a second lower shell, and the middle shell is arranged between the second upper shell and the second lower shell; the first end of the rotating mechanism is clamped between the first upper shell and the first lower shell, and the second end of the rotating mechanism is arranged between the second upper shell and the second lower shell.

In one embodiment, as shown in fig. 1 and 2, the first end of the rotating mechanism is fixedly disposed between the first upper shell and the first lower shell; the second end of the rotating mechanism is rotatably disposed between the second upper case and the second lower case.

More specifically, a stopper mechanism is provided on the second upper case 30 and/or the second lower case 40. The limiting mechanism is matched with the limiting part 34 on the rotating shaft 33 to limit the rotating angle of the rotating shaft 33. The first vehicle body 1 and the second vehicle body 2 rotate about the axis of the rotating shaft 33. The limiting mechanism comprises a limiting block 37 and a limiting block mounting groove 38, and the limiting mechanism is located between the second upper shell 30 and the second lower shell 40, so that the limiting block mounting groove 38 can be arranged on the second lower shell 40, also can be arranged on the lower surface of the second upper shell 30, and also can be arranged on both the second lower shell 40 and the second upper shell 30 to form the limiting block mounting groove 38. In the specific example shown in fig. 1 and 3, the stopper mounting groove 38 is provided on the second lower case 40. One end of the rotating shaft 33 between the middle shell 50 and the second lower shell 40 is provided with a limiting part 34, the limiting part 34 comprises a limiting boss with a notch, the limiting block 37 is a limiting piece corresponding to the limiting boss, and the top surface of the limiting piece can respectively abut against the two ends of the limiting boss when the rotating shaft 33 rotates so as to limit the rotating angle of the rotating shaft 33.

A second sleeve or bearing 35 is sleeved on one end of the rotating shaft 33, which is arranged between the second upper shell 30 and the second lower shell 40, correspondingly, a rotating upper connecting groove 301 is arranged on the second upper shell 30, a rotating lower connecting groove 401 is arranged on the second lower shell 40, the rotating upper connecting groove 301 and the rotating lower connecting groove 401 are oppositely arranged, and in order to install the bearing 35 or the second sleeve, limiting grooves are arranged in the rotating upper connecting groove 301 and the rotating lower connecting groove 401, more specifically, when the bearing 35 is sleeved on the rotating shaft 33, bearing limiting grooves are arranged in the rotating upper connecting groove 301 and the rotating lower connecting groove 401; when the second sleeve is sleeved on the rotating shaft 33, sleeve limiting grooves are formed in the upper rotating connecting groove 301 and the lower rotating connecting groove 401. The shaft 33 is rotatable in a second sleeve or bearing 35, so that the first body 1 and the second body 2 can rotate relatively.

First automobile body 1 and second automobile body 2 pass through slewing mechanism 3 to be connected, and for the convenience of customers observation balance car's behavior, the balance car still includes indicator lamp plate 305, and indicator lamp plate 305 is connected with control circuit board, and the operating condition of accessible above that luminescent device feedback balance car. For keeping the trampling balance of the balance car, all be equipped with the footboard on first automobile body 1 and the second automobile body 2, supply the user to trample, in order to avoid the user to shelter from light of luminescent device, indicator lamp plate 305 sets up the junction at first automobile body 1 and second automobile body 2, the position that slewing mechanism 3 corresponds promptly, as shown in fig. 1 and fig. 3, indicator lamp plate 305 sets up below the position that second epitheca 30 and slewing mechanism 3's second end 32 correspond, more specifically speaking, indicator lamp plate 305 is located in last spread groove 301 of rotating, be equipped with lamp board post 306 and indicator lamp hole 307 in the last spread groove 301 of rotating, lamp board post 306 is used for installing indicator lamp plate 305, indicator lamp hole 307 is used for seeing through luminescent device light on indicator lamp plate 305, the position of indicator lamp hole 307 corresponds with the luminescent device on indicator lamp plate 305. The light-emitting device can be an LED lamp bead or other small-sized lamps. A lamp cover 308 covers the indicator hole 307.

In the above-mentioned embodiment in which the first end 31 of the rotating mechanism 3 is fixedly disposed in the first vehicle body 1, the connection structure of the first end 31 of the rotating mechanism 3 with the first upper shell 10 and the first lower shell 20 may be: one end of the first upper shell 10 close to the second upper shell 30 is provided with a rotating mechanism fixing groove 101, correspondingly, one end of the first lower shell 20 close to the second lower shell 40 is provided with a rotating mechanism fixing groove 101, the rotating mechanism 3 is fixed between the rotating mechanism fixing groove 101 and the rotating mechanism fixing groove 101, after the rotating mechanism fixing groove 101 and the rotating mechanism fixing groove 101 are fixedly connected with the first upper shell 10 and the first lower shell 20, a fixing groove fixedly connected with the first end 31 of the rotating mechanism 3 is formed, the fixing groove can limit the relative rotation of the first end 31 of the rotating mechanism 3 and the first vehicle body 1, and the first vehicle body 1 and the second vehicle body 2 can smoothly rotate relatively. The connection structure of the first end 31 of the rotating mechanism 3 and the first upper shell 10 and the first lower shell 20 can also be: a rotating mechanism fixing column 102 is arranged at one end of the first upper shell 10 close to the second upper shell 30, a rotating mechanism fixing hole 36 is arranged at the first end 31 of the rotating mechanism 3, the rotating mechanism fixing column 102 is matched with the rotating mechanism fixing hole 36 in shape, the rotating mechanism 3 is fixed between the first upper shell 10 and the first lower shell 20 through the rotating mechanism fixing column 102, and during installation, the rotating mechanism fixing column 102 penetrates through the rotating mechanism fixing hole 36, so that the first end 31 of the rotating mechanism 3 is fixedly connected with the first vehicle body 1 and is relatively static, and the first vehicle body 1 and the second vehicle body 2 can smoothly rotate relatively; the rotating mechanism fixing hole 36 may be a through structure or a non-through structure, and when the rotating mechanism fixing hole 36 is a through structure, the rotating mechanism fixing column 102 may be disposed at the corresponding position of the first upper shell 10 and the first lower shell 20; when the rotating mechanism fixing hole 36 is a non-through structure, a rotating mechanism fixing post 102 is disposed at a corresponding position of the first upper case 10 or the first lower case 20, and the rotating mechanism fixing post 102 is disposed toward the rotating mechanism fixing hole 36, so that it can be inserted into the rotating mechanism fixing hole 36.

Based on the above embodiment, the connection of the second axle 701 and the second end 32 of the rotating mechanism 3 to the same platform can make the rotation of the rotating mechanism 3 and the second wheel 70 smoother. More specifically, when the second axle mount 302 is disposed on the second upper case 30, and the second axle 701 is coupled to the second upper case 30, it is preferable that the second end 32 of the rotating mechanism 3 be rotatably interposed between the second upper case 30 and the second lower case 40, or that the second end 32 of the rotating mechanism 3 be rotatably disposed in the first sleeve of the second upper case 30.

When the second axle mount is disposed on the second upper shell, the second axle mount 302 includes a second axle plate securing hole 303 and a second axle mounting slot 304; the second axle mounting grooves 304 are adapted to the second axle, the second axle is placed in the second axle mounting grooves, the second axle sheet fixing holes 303 include two groups, and the two groups of the second axle sheet fixing holes 303 are symmetrically arranged on two sides of the second axle mounting grooves 304. A second axle pressing sheet 309 is further arranged on the second axle mounting seat 302, and the second axle is fixed in the second axle mounting groove through the second axle pressing sheet 309; the second axle pressing plate 309 is fixedly connected with the second axle mounting seat 302 through screws, so that the second axle cannot be separated from the second axle mounting groove.

Since the middle shell 50 is disposed below the second upper shell 30, the second axle mount 302 disposed on the lower surface of the second upper shell 30 easily interferes with the middle shell 50, and therefore, according to this embodiment, as shown in fig. 1 and 4, it is preferable that a through groove 501 is provided on the middle shell 50, the second axle mount 302 passes through the through groove 501 below the middle shell 50 to avoid interference with the middle shell 50, and at this time, the second axle is also located below the middle shell 50, and the second axle mount 302 fixes the second axle in the second axle mount groove 304 through the second axle pressing piece 309. The second axle mounting seat 302 is arranged on the second upper shell 30, and compared with the existing upper shell structure, only a second control panel connecting column and a second contact through hole on the second upper shell 30 are eliminated, so that the second upper shell 30 is slightly different from the original structure, a manufacturer can directly modify the original upper shell structure, the production process is simplified, waste is avoided, and the second upper shell 30 and the second axle are also convenient to mount. Preferably, the through-slot 501 of the middle shell 50 has an opening facing the second wheel body, so that the second upper shell 30 and the second axle can be installed first, and then the second axle mounting seat 302 is directly passed through the through-slot 501, and the installation is simpler and more convenient. Meanwhile, the second axle mount 302 and the second upper shell 30 are equivalent to clamping the middle shell 50 therebetween, so that the middle shell 50 and the second shell are connected more tightly, and the second vehicle body 2 has better and more stable mechanical strength.

A second control plate connecting column 502 is arranged at the lower side of the middle shell, and the second control plate 5 is fixedly connected with the middle shell 50 through the second control plate connecting column 502; to make the installation of the second control board 5 more secure, the second control board connection posts 502 include two sets of the second control board connection posts 502, and the two sets of the second control board connection posts 502 are respectively disposed on two sides of the second axle mount 302, so that the second control board 5 does not interfere with the second axle mount 302.

With respect to the mounting position of the first wheel 60, in some embodiments, the first body includes the first wheel 60, the first wheel 60 is disposed on the outer side end of the first upper shell 10 away from the middle shell 50, the second body includes the second wheel 70, and the second wheel 70 is disposed on the outer side end of the middle shell 50 away from the first upper shell 10. More specifically, the first wheel 60 includes a first axle 601, the first upper case 10 is provided with a first axle mount 103, the first axle mount 103 includes a first axle plate fixing hole 104 and a first axle mounting groove 105; first axle mounting groove 105 and first axle 601 looks adaptation, first axle 601 is laid in first axle mounting groove, and first axle clamp plate fixed orifices 104 includes two sets ofly, and two sets ofly first axle clamp plate fixed orifices 104 symmetry sets up in first axle mounting groove 105 both sides. The first axle mounting seat 103 is further provided with a first axle pressing sheet 602, and the first axle is fixed in the first axle mounting groove through the first axle pressing sheet 602; first axletree preforming 602 passes through screw and first axletree mount pad 103 fixed connection, guarantees that first axletree can not break away from first axletree mounting groove.

Regarding the mounting position of the first wheel 60, in other embodiments, the first body includes the first wheel 60, the first wheel 60 is disposed on the outer side end of the first lower shell 20 away from the middle shell 50, more specifically, the first wheel 60 includes a first axle 601, the first lower shell 20 is provided with a first axle mounting seat 103, the first axle mounting seat 103 includes a first axle pressing piece fixing hole 104 and a first axle mounting groove 105; first axletree mounting groove 105 and first axletree adaptation, first axletree are laid in first axletree mounting groove, and first axletree pressure piece fixed orifices 104 includes two sets ofly, and two sets of first axletree pressure piece fixed orifices 104 symmetry sets up in first axletree mounting groove 105 both sides. The first axle mounting seat 103 is further provided with a first axle pressing sheet 602, and the first axle is fixed in the first axle mounting groove through the first axle pressing sheet 602; first axletree preforming 602 passes through screw and first axletree mount pad 103 fixed connection, guarantees that first axletree can not break away from first axletree mounting groove.

Based on the above embodiment, preferably, the first vehicle body includes the first control panel 4, in order to protect the first control panel 4, the first control panel 4 is located between the first upper shell 10 and the first lower shell 20, the first upper shell 10 or the first lower shell 20 is provided with the first control panel connection column 106, and the first control panel 4 is fixedly connected with the first upper shell 10 or the first lower shell 20 through the first control panel connection column 106; in order to make the installation of the first control board 4 more firm, the first control board connection columns 106 include two sets, and the two sets of first control board connection columns 106 are respectively arranged on two sides of the first axle mounting seat 103, so that the first control board 4 does not interfere with the first axle mounting seat 103.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (9)

1. A balance car comprises a first car body, a second car body and a rotating mechanism, and is characterized in that: the first vehicle body includes a first upper shell and a first lower shell, the second vehicle body includes a second upper shell, a middle shell, and a second lower shell, the middle shell is disposed between the second upper shell and the second lower shell; the first end of the rotating mechanism is clamped between the first upper shell and the first lower shell, and the second end of the rotating mechanism is rotatably arranged between the second upper shell and the second lower shell; and the second upper shell and/or the second lower shell are/is provided with a limiting mechanism.

2. The balance car of claim 1, wherein: the first end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell.

3. The balance car of claim 2, wherein: the upper shell of the second shell is provided with a rotating upper connecting groove, the lower shell of the second shell is provided with a rotating lower connecting groove, and the second end of the rotating mechanism is clamped between the rotating upper connecting groove and the rotating lower connecting groove.

4. The balance car of claim 2, wherein: a rotating mechanism fixing groove is formed in one side, close to the middle shell, of the first upper shell and/or the first lower shell; the first end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing groove; or

A rotating mechanism fixing column is arranged on one side, close to the middle shell, of the first upper shell and/or the first lower shell; the first end of the rotating mechanism is fixedly arranged between the first upper shell and the first lower shell through the rotating mechanism fixing column.

5. The balance car of claim 1, wherein: the first end of the rotating mechanism is rotatably arranged in the first vehicle body, and the second end of the rotating mechanism is rotatably arranged in the second vehicle body; the rotating mechanism comprises a rotating shaft, one end of the rotating shaft is connected with the first vehicle body, and the other end of the rotating shaft is connected with the second vehicle body; the rotating shaft rotates relative to the first vehicle body and the second vehicle body; one end of the rotating shaft is provided with a limiting part, and a limiting mechanism is arranged at the position, corresponding to the limiting part, of the first vehicle body or the second vehicle body.

6. The balance car of claim 5, wherein: the first epitheca with set up on the second epitheca and rotate the spread groove, first inferior valve with correspond on the second inferior valve the position department that rotates the spread groove sets up and rotates spread groove down, the both ends cover of pivot is equipped with the bearing, rotate the spread groove with be equipped with corresponding bearing mounting groove under the rotation on the spread groove.

7. The balance car of claim 1, wherein: a second axle mounting seat is arranged on the lower side of the second upper shell and comprises a second axle pressing sheet fixing hole and a second axle mounting groove; the middle shell and the second axle mounting seat are provided with through grooves in corresponding positions, and the second axle mounting seat penetrates through the through grooves to be connected with the second axle.

8. The balance car of claim 7, wherein: a second control plate connecting column is arranged on the lower side of the middle shell and is positioned on the outer side of the second axle mounting seat; the second control panel connecting columns comprise two groups, and the two groups of second control panel connecting columns are respectively arranged on two sides of the second axle mounting seat.

9. The balance car of claim 1, wherein: the first upper shell or the first lower shell is provided with a first axle mounting seat, and the first axle mounting seat comprises a first axle pressing sheet fixing hole and a first axle mounting groove; the first axle pressing piece fixing holes comprise two groups, and the two groups of first axle pressing piece fixing holes are symmetrically arranged on two sides of the first axle mounting groove; a first control panel connecting column is arranged on the first upper shell or the first lower shell; the first control panel connecting columns comprise two groups, and the two groups of first control panel connecting columns are respectively arranged on two sides of the first axle mounting seat.

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